在半导体收音机中晶体管代替了真空管.In semiconductor receivers transistors take the place of vacuum tubes.与老式真空管相比,晶体管具有许多优点.Transistors have many advantages over the old - fashioned vacuumtube valves.真空管或显影管都未破碎.No vacuum or picture tube...
Erecting signs on the road aims to provide traffic rules.在公路上立标是为了使行驶的车辆有章可循.Could you tell me the specific lift - slab procedure for erecting buildings?能否告之用升板法安装楼房的具体程序?Nations can restrict their foreign trade by erect...
What does the theory of plate tectonics maintain?这板块构造学说的理论讲些什么?Geologists describe the motion of the plates and the consequences of such motion as plate tectonics.地质学家把板块运动及这种运动所造成的后果看作是板块构造运动.The idea of sea - floor sp...